LT8673

RECOMMENDED FOR NEW DESIGNS

Active Rectifier Controller with Voltage Monitoring

Data Sheet (Rev. Sp0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.83

Viewing:

Overview

Reverse Input Protection to -40V
Improved Performance Compared to a Schottky Diode
Reduce Power Dissipation by > 90%
Reduce Drop to 20mV
Ultrafast Transient Response
- Rectifies 6V_P-P Up to 50kHz
- Rectifies 2V_P-P Up to 100kHz
Wide Operating Voltage Range: 3V to 42V
Two Integrated Comparators for Cold Crank Detection
- Programmable Anti-glitch Filters
- Dedicated Enable Pin (ENR)

Voltage Monitoring Protection Pins
Low 55μA Quiescent Current in Operation
Low 3.8μA Shutdown Current
Accurate 1.2V Enable Pin Threshold
Small 20-Lead 3mm x 4mm Side-Wettable Quad Flat No-Lead (QFN) Package
AEC-Q100 Qualified for Automotive Applications

The LT8673 is an active rectifier controller for reverse input protection that includes two independent low I_Q comparators with programmable glitch rejection filters for cold start pulse detection and two voltage monitoring protection pins to sense the battery voltage safely using an external resistive divider and ADC (analog-to-digital converter). The highly integrated comparators and active rectifier solution greatly simplify the Bill of Materials (BOM) and shrinks the printed circuit board (PCB) area. The controller drives an external N-channel Metal-oxide semiconductor field-effect transistor (MOSFET) to replace a power Schottky diode. Its very low quiescent current and fast transient response meet the tough requirements in automotive applications where AC input signals of up to 100kHz are present. These signals are rectified with minimum power dissipation on the external MOSFET, simplifying thermal management on the PCB.

With a drop of only 20mV, the LT8673 solution eases the minimum input voltage requirement during cold crank and start-stop, allowing simpler and more efficient circuits. A fast turn-off minimizes reverse current transients if the input power source fails or is shorted. An available shutdown mode reduces the quiescent current to 3.8μA.

An integrated auxiliary boost regulator provides the required boost voltage to turn the external MOSFET fully on. A FAULT pin signals if the external FET is not ready to take load current.

APPLICATIONS

Automotive Battery Protection
Industrial Supplies
Portable Instrumentation

Part Models: 2
1ku List Price: Starting From $2.83

Documentation

Data Sheet 1

LT8673: Active Rectifier Controller with Voltage Monitoring Data Sheet (Rev.Sp0) 03/28/2023

Request an NDA

Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). Please send your project details, company information and contact by e-mail to BUC_Doc_Request@analog.com. Additional support is available from your Analog Devices local sales.

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8673RUDCM#WTRMPBF	20-Lead Plastic Side Solderable QFN (3mm × 4mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8673RUDCM#WTRPBF	20-Lead Plastic Side Solderable QFN (3mm × 4mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8673

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

Active Rectifier Controller with Voltage Monitoring

Buy Now View Details

Product Details

Evaluation board EVAL-LT8673-AZ is an active rectifier with reverse protection featuring the LT8673. It includes two low I_Q comparators with programmable glitch rejection filters and input voltage monitoring protection. The demo board is designed for 5A load current. The input voltage range of the LT8673 is –40V to +42V. Two clamping diodes at the input side are used on the board to protect the IC from overvoltage spikes at the input, thus limiting the application’s DC input voltage range to –15V and +35V.

The two low I_Q comparators are used for detecting cold crank and filtering short pulses. Two voltage monitoring protection pins can sense the battery voltage safely and provide clean, glitch-free signal to the ADC (analog-to-digital converter).

Latest Discussions

No discussions on LT8673 yet. Have something to say?

Start a Discussion on EngineerZone®